Things have settled down a lot since yesterday. Fern appears to be eating normally, and we have a routine that works for both of us. She still picks the pups up a lot which makes me uncomfortable, but she's given up the idea of moving them to a "safe place" and seems resigned to remain in the whelping box, at least until someone forgets to latch the pen!
Pups are growing like crazy, and everyone is doing well. Big, strong, chubby pups, all vigorous nursers. Today we pack them up and take them in to have their dew claws done. Fern will not be happy, but the bitches all seem to survive having their pups removed for a couple of hours.